Sleeving or Boring OS 1557668 Disc Brake Rear Wheel Cylinders: SS or Brass? Who?

[bezhawk]

This will also reduce pedal pressure applied enough to notice, so if the stock brakes require a lot of pressure this is a good idea. In general with the better (much) traction available with modern tires increasing the bore is a good idea as a more powerful braking action can be used with the extra traction.

Decreasing the bore of the master cylinder will do the same thing. However you will have further pedal travel.